How many topics are in the H2 Biology syllabus?

The 9477 syllabus is organised into four Core Ideas (Cells & Biomolecules, Genetics & Inheritance, Energy & Equilibrium, Biological Evolution) and two Extension topics (Infectious Diseases; Impact of Climate Change). Within these, there are multiple sub-topics - the total number of examinable learning outcomes runs to over 100 across all papers.

Which H2 Biology topics carry the most marks?

Core Ideas 1-3 (Cells & Biomolecules, Genetics & Inheritance, Energy & Equilibrium) are the heaviest in terms of mark allocation because they form the basis for structured questions in Paper 2 and essay questions in Paper 3. These three strands together typically account for the majority of the written-paper marks.

Is H2 Biology harder than H2 Chemistry?

The two subjects test different skill sets. H2 Biology demands strong essay-writing ability, precise use of terminology, and the capacity to synthesise information across topics. H2 Chemistry leans more heavily on quantitative problem-solving. Neither is inherently "harder" - the difficulty depends on your personal strengths.

How should I prepare for Paper 4 (Practical)?

Start lab work early in JC1 and keep a detailed lab notebook. Focus on measurement accuracy, data presentation (tables and graphs), and the ability to evaluate experimental procedures. Paper 4 skills develop gradually, so consistent practice across both years is essential. See the H2 Biology practical experiments guide for structured walkthroughs.

Can I self-study H2 Biology without tuition?

Yes, many students achieve strong grades through disciplined self-study using the official syllabus, past papers, and free online resources. However, if you find yourself consistently struggling with essay technique or cross-topic synthesis, targeted support can help. See our A-Level Biology tuition page for information on how structured coaching works.

H2 Biology 9477 Syllabus 2026: PDF, Papers, Specimen

Study guide19 Oct 2025, 00:00 Z

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Q: Where can I find the H2 Biology 9477 syllabus PDF for 2026 and 2027, and what does it cover?
A: The current SEAB H2 Biology code for the 2026 and 2027 A-Level exams is 9477. This page links the official PDF, the four specimen papers, Paper 1-4 weightings, the 9477 vs 9744 change notes, and a revision plan built around the four Core Ideas plus Extension topics A and B.

TL;DR
If you are searching for h2 biology syllabus 2026, h2 bio syllabus 2026, or 9477 syllabus, use the 9477 SEAB PDF and specimen papers linked below.
Papers 2 and 3 together carry 65 % of the final grade; Paper 4 carries 20 %.

Concrete example: After revising Core Idea 3, practise one photosynthesis structured question, one respiration essay paragraph, and one rate-practical graph rather than only rereading the notes.

Looking for free H2 Biology notes by chapter/topic (plus the printable PDF bundle)? Start here: free H2 Biology notes.

Preparing for H2 Biology under the 9477 syllabus (first exam 2026) requires systematic coverage of four Core Ideas plus two Extension topics, alongside consistent practical-skills rehearsal for Paper 4. Use this guide to align your study schedule with SEAB's expectations.

If you are building a self-study plan, use the paper-by-paper links below to separate MCQ recall, structured explanation, essay planning, and practical evaluation.

H2 Biology is widely described as having the highest memorisation load among H2 sciences. The syllabus covers molecular-level detail across cell biology, genetics, ecology, and physiology. However, rote memorisation alone does not determine exam success - the real challenge is applying memorised facts with keyword precision in novel contexts.

Download (Official SEAB Syllabus PDF)

SEAB H2 Biology (9477) Syllabus 2026 PDF

Status: SEAB's current H2 Biology (9477) syllabus PDF is labelled for 2026. Use 9477 for the 2026 and 2027 H2 Biology exams. The older 9744 code is legacy material only. Scheme of assessment: Paper 1 (1 h, 30 marks, 15 %), Paper 2 (2 h, 90 marks, 30 %), Paper 3 (2 h, 75 marks, 35 %), Paper 4 (2 h 30 min, 50 marks, 20 %).

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If your search was only 9477, 9477 syllabus, or h2 biology syllabus 2026, use this page as a routing page before downloading anything.

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Ezekiel Tan·Academic Advisor (Biology)

What you have	What SEAB source confirms	Next Eclat route
`9477` or `9477 syllabus`	Biology is listed as revised H2 syllabus 9477 on the 2026 SEAB A-Level syllabus index, with specimen papers linked for Papers 1-4.	Download the PDF above, then open the specimen paper guide.
Old `9744` notes	The SEAB 2026 index still lists H2 Biology 9744 as an old-syllabus code, with 2026 marked as its last year of exam.	Check any inherited topic, paper format, or practical weighting against 9477 before using it.
Paper 4 practical gap	9477 Paper 4 is the practical component, with Planning plus MMO, PDO, and ACE skill areas.	Use the Paper 4 practical strategy before choosing a lab guide.
Repeated week-to-week gaps	The syllabus tells you the assessment shape, not how your mistakes should be sequenced.	Bring the error map to H2 Biology tuition Singapore after identifying the weak paper.

Answer layer	What to include	Common trap
Evidence from the question	Data, trend, diagram feature, named condition, or context from the stem	Writing a memorised paragraph before using the stimulus
Mechanism	Cause-and-effect biological process that explains the evidence	Listing facts without showing how one step leads to the next
Keyword precision	Named structures, molecules, enzymes, processes, or units where relevant	Repeating vague words such as `it`, `substance`, or `process`
Paper skill	MCQ elimination, structured explanation, essay paragraph, graph reading, or practical evaluation	Using the same revision method for every paper

Change	Topic	Detail
Removed	Gene regulation	Lac operon and trp operon mechanisms no longer examined
Removed	G-protein coupled receptors	Structural details of GPCRs removed from scope
Removed	Incomplete dominance (detailed)	Reduced coverage under genetics
Added	Hardy-Weinberg equilibrium	Quantitative calculations now examinable (Core Idea 2)
Modified	Ecology frameworks	Updated terminology and framing under Core Idea 4 and Extension B

If your material says...	Treat it as...	What to do next
9477	Current H2 Biology syllabus route	Use the 9477 PDF, specimen papers, and the paper-by-paper links below.
9744	Old-syllabus comparison material in 2026	Check whether the topic, paper format, and practical weighting still match 9477 before revising from it.
Paper 4 practical	A recurring skills paper, not a topic-only revision block	Pair the syllabus page with H2 Biology Paper 4 practical strategy and the H2 Biology practical experiments hub.

Syllabus signal	Student task	What to practise next
Core Idea 1 appears in cell, membrane, biomolecule, and microscopy questions	Keep structure, function, and evidence in the same answer	One Paper 2 data-response question plus one microscope or drawing routine.
Core Idea 2 now includes quantitative genetics work	Separate inheritance logic from calculation steps	One genetics structured question, then one short explanation of what the calculated value means.
Core Idea 3 links energy, enzymes, photosynthesis, respiration, and homeostasis	Turn processes into cause-and-effect chains	One structured explanation, one graph interpretation, and one practical rate calculation.
Core Idea 4 and Extension topics often require unfamiliar contexts	Practise applying known mechanisms to new data	One DBQ or essay paragraph that starts with evidence from the stem.
Paper 4 carries practical skills that mature slowly	Schedule lab skills before the final revision sprint	One MMO/PDO/ACE drill every cycle, not only content notes.

H2 Biology 9477 Syllabus 2026: PDF, Papers, Specimen

Download (Official SEAB Syllabus PDF)

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Sources

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Exam Format at a Glance

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Syllabus Topics

Core Ideas

Extension Topics

What Changed: 9477 vs 9744

If you searched for 9744 syllabus

Specimen Papers

Tips for Each Paper

Paper 1 (MCQ, 15 %)

Paper 2 (Structured, 30 %)

Paper 3 (Free Response, 35 %)

Paper 4 (Practical, 20 %)

How to Use This Syllabus Page

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Frequently Asked Questions

How many topics are in the H2 Biology syllabus?

Which H2 Biology topics carry the most marks?

Is H2 Biology harder than H2 Chemistry?

How should I prepare for Paper 4 (Practical)?

Can I self-study H2 Biology without tuition?

Next Steps

Related Posts

Paper	Weighting	Duration	Marks	Focus
Paper 1	15 %	1 h	30	30 multiple-choice questions spanning the full syllabus
Paper 2	30 %	2 h	90	Structured questions with stimulus data and multi-part responses
Paper 3	35 %	2 h	75	Long structured questions, data-based questions, and one free-response essay
Paper 4	20 %	2 h 30 min	50	Practical planning, data processing, and evaluation in the laboratory